Stuck at pulse Magnezone

[Fre153]

Hi! I need help beating Zel and mostly his pulse magnezone..

My team is:

Level 76 Mamoswine: Ancient power, Earthquake, Blizzard and amnesia with a never melt-ice

Level 78 Galvantula: electroball, thunderwave, Discharge and bug buzz with Lax incense

Level 76 Hariyama : Fake out, Heavy slam, Close combat and Sunny day (that's me experimenting) with a Black belt

Level 78 Empoleon: Surf, Brine, Brick Break (for his umbreon) and drill peck With wave incense

Level 76 Noivern : Flamethrower, Fly, Hurricane, dragon pulse with scope lense

Level 78 Incineroar: Flamethrower, Outrage, Dark pulse and Darkest lariat with fire gem (I changed Flare Blitz like a dumb-ass just before devon corp but anyway the magnezone is faster and always one-shot incineroar)

 

 

I can pretty much one shot his entire team and be left with incineroar, mamoswine and noivern with full healt but i have no healing item/revive after the devon corp puzzle..

I don't have smack down or ways to slower magnezone, not that I can think off.. I would really appreciate some help because i don't wanna restart the game

Thanks!